#10453: Problem with old submodule
-----------------------------+----------------------------------------------
Reporter: davidloeffler | Owner: craigcitro
Type: defect | Status: needs_review
Priority: major | Milestone: sage-4.7.1
Component: modular forms | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author: David Loeffler
Merged: | Dependencies:
-----------------------------+----------------------------------------------
Description changed by davidloeffler:
Old description:
> Weird things happen if you try to compute the old submodule of a Gamma1
> modular forms space. E.g.
>
> {{{
> sage: CuspForms(Gamma1(11), 2).old_submodule() # crashes
> }}}
>
> This turns out to be because:
>
> {{{
> sage: ModularForms(Gamma1(11),
> 2).hecke_module_of_level(1).hecke_module_of_level(11)
> Modular Forms space of dimension 2 for Congruence Subgroup Gamma0(11) of
> weight 2 over Rational Field
> }}}
>
> so the degeneracy level-raising map is getting computed for the wrong
> space!
New description:
Weird things happen if you try to compute the old submodule of a Gamma1
modular forms space. E.g.
{{{
sage: CuspForms(Gamma1(11), 2).old_submodule() # crashes
}}}
This turns out to be because:
{{{
sage: ModularForms(Gamma1(11),
2).hecke_module_of_level(1).hecke_module_of_level(11)
Modular Forms space of dimension 2 for Congruence Subgroup Gamma0(11) of
weight 2 over Rational Field
}}}
so the degeneracy level-raising map is getting computed for the wrong
space!
Prerequisite for #11601.
--
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Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/10453#comment:4>
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